I have read a few problems people say they have or complain about. After I installed mine. There was a slight learning curve. But , I have to say follow the instructions. Good running engine . First get it happy , drive it, watch afr targets. Then go back to idle settings. Watch i.a.c. count . Get it between 0-4 after driving. I then installed 6al with mechanical timing . Then rewired, for timing control. Again learn how it repronds to small changes. I'm a hugh fan once I got the hang of it. I use it on Buick 455 with poor intake, and its great .